Very bad service, no feedback from Roena

I recently took out a new contract with Vodacom on a Huawei Nova 8i, after discovering that the device is not a dual sim and had other things I didnt like I contacted Vodacom online within 3 days to request a return and exchange of the device. And I been since then calling in to get assisted and every time I do I get told that the lady by they name of Roena who helped me initially will give me a call back till today she hasn't called. Even today I contacted Vodacom at least 3 times to get help but nothing has happened. Now I even regret taking out they contract to begin with.